I am trying to follow the instructions at https://docs.acados.org/interfaces/index.html with the python interface. However, even though the installation went successfully, I am as of yet unable to run any of the python examples.
The instructions with the python module seems to be not completely updated, for example the instructions are to install the acados_template files with pip, but the Readme file in acados/interfaces/acados_templates correctly says to install using pip3.
There is a small bug with the rel_sync_machine_example, where it does not create the folder c_generated_code by itself unlike the other two examples, but it goes away if you manually create the file.
The error that I cannot get past that happens in all examples:
is the following:
The error seems to be dlopen not being able to open the shared library libacados_solver_pendulum_ode.so. The library is already created and the gcc build process does not raise any error, but it just cannot open the library.
I am using Ubuntu 16.04.6 LTS, gcc 7.4.0 and python 3.5.
That should depend on whether you are running from a virtual environment and/or on your system’s settings. The Package requires anyway that you use Python 3.5 or 3.6 at the moment. I have updated the instructions anyway in order to make this clearer (they will be uploaded in the next hours/couple of days).
I have made a PR to fix this, thanks! (it should be merged in the next hours)
Regarding this, could you send me the build error right above? It works fine on my machine.
Yes, the libraries were in my LD_LIBRARY_PATH and I had previously checked in my terminal if it was the problem, but the path seemed to be there.
But thanks to this tip, I have solved the problem. You see i am using pycharm and while the environment variables are correctly set in the pycharm terminal, due to me having previously tinkered with the run/build configurations of the pycharm, the LD_LIBRARY_PATH was not being adopted from the terminal, but was rather being overriden by my previous configuration.
With that fixed, I am able to run both:
however, the acados/examples/acados_template/python/rel_sync_machine_example is giving me a build error: